converter voltmeter to frequency meter

This is design circuit for converter meter voltage to frequency. Normally we often encountered the frequency meter can be used in speed sensor, tachometer, measurement or signal recurring. This frequency to voltage converter (FVC) can be used to change the voltage into a digital or analog tachometer. Circuit that is consists of three blocks. The f
converter voltmeter to frequency meter - schematic

irst block is squarer, the input signal to a square wave. This block was protected the circuit from high input voltage up to 400V, but remember this only works if the value of capacitor C1 is for 400V. Input Impedance around 560k, so it is safe to connect the ignition pick-up coil in parallel with the CDI (capacitor discharge ignition) circuits without a problem. Supply is protected from voltage spike by Zener diode D3. This is the figure of the circuit; The second block is retriggerable mono stable multi vibrator. Mono stable multi-vibrator is to convert fixed width pulses to provide output, the voltage output of the average will depend on the duty factor pulses input / waveform, but only depends on the input frequency. Pulse width is determined by R9 + R5 and C4. According to the datasheet of IC 4528, the period of the mono stable : R and C are in ohm and Farad, VDD-VSS is in the pin 16 voltage minus the voltage on pin 8, and t in seconds. Minimal value of R9, the mono stable multi-vibrator output pulse width will be 0. 2 * 4700 * 22e-9 * ln (12) = 5. 139e-5, and this will change the frequency of 19. 460 kHz to 12 Volt output. This gives a conversion factor 1. 622kHz/Volt. If you set the maximum value to R9 (100k) then the pulse width of mono stable multi-vibrator output will 1. 145 MS. This setting will give the maximum voltage output of 12V at 874Hz, or about 72. 8Hz per Volt conversion. If you use the tachometer to the...

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